Robtex

Up: 159.253.80.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 159.253.81.0/25
Down right: 159.253.81.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
159.253.81.35	A	mail2.h2o-engineer.info
159.253.81.74	A+PTR	mail.kemiteks.com
159.253.81.123	PTR	mail.orkun.com
159.253.81.123	A	mail.orkun.co.uk
159.253.81.162	A+PTR	mail.asbir.com
159.253.81.162	A	ns2.asbir.com
159.253.81.162	A	ns1.asbir.com
159.253.81.254	A+PTR	srvexc.ongan.com.tr
159.253.81.254	A+PTR	mail.ongan.com.tr